Download or read book Natural Regeneration of Subalpine Fir and Engelmann Spruce in Partially Harvested High elevation Stands in East central British Columbia written by O. A. Steen and published by British Columbia Forest Science Program. This book was released on 2008 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study examines factors affecting natural restocking of small openings created by partial harvesting of high elevation (> 1500 m) Engelmann spruce (Picea engelmannii Parry ex Engelm.)-subalpine fir (Abies lasiocarpa [Hook.] Nutt.) stands in east-central British Columbia, Canada. We examined the effects of opening size (0.03, 0.13, and 1.0 ha), seedbed, and seed supply on density of post-logging regeneration for 10 years post-harvest. The effect of opening size on growth release of advance regeneration was also examined. Both seed production and seedbed limited densities of post-logging seedlings. Densities of subalpine fir and Engelmann spruce post-logging regeneration remained low at two sites where seedfall was low. Seedbed scarification significantly increased seedling densities where seed rain was high. In the absence of scarification, abundant seed production had little effect on post-logging seedling densities. Increased height and basal diameter growth of advance regeneration following logging was greater on 1.0-ha than 0.13-ha and 0.03-ha openings. This study demonstrates that post-logging natural regeneration in combination with advance regeneration can restock small openings in partially harvested stands where there is an adequate distribution of mineral soil seedbed and logging or site preparation coincide with or shortly precede a year of abundant seed production.
Download or read book Natural Regeneraion of Subalpine Fir and Engelmann Spruce in Partially Harvested High elevation Stands in East central British Columbia written by and published by . This book was released on 2008 with total page 35 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Development and Structure of Three High elevation Old Spruce fir Stands in the Quesnel Highland of East central British Columbia written by O. A. Steen and published by University of British Columbia Press. This book was released on 2005 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study describes the composition, size and age structure, and development of three old Engelmann spruce-subalpine fir stands at high elevations (>1500 m) in the Quesnel Highland in east-central British Columbia. The descriptions provide a basis for designing alternative silvicultural systems that will maintain usable old-forest habitat for mountain caribou and other old-growth-dependent species. Subalpine fir, which comprised 86% of all stems in the three stands, had inverse-J-shaped size and age profiles. Engelmann spruce included the largest trees in each stand but had bimodal size and age profiles. Age structure interpretations suggest that the stands have developed over periods of about 290-450 years since the last major stand-level disturbances (probably wildfires). Current stand age structures contain no clear evidence of post-establishment stand-level disturbances, although the data do not exclude the possibility of such disturbances. Approximately 29% of the fir trees and 13% of the spruce trees were dead. Age analyses of the tree seedling banks in the three stands indicate stable populations with continuous recruitment during the last 40 years. Young seedlings occurred preferentially on woody debris in advanced stages of decay, suggesting that seedling density differences among stands may be due at least partially to differences in the amount of woody debris. The stand that apparently had the shortest time (about 290 years) for development since major disturbance had a structure that was still adjusting to disturbance. Evidence of this adjustment includes a bimodal fir age distribution and a high density of small trees that are apparently undergoing thinning. In addition, this stand had very few large (>60 cm dbh) live or dead trees and low volumes of coarse woody debris, especially in large and well-decomposed pieces, compared to the other two stands. A comparison of the three stands in this study suggests that naturally established high-elevation forests of the ESSFwc3 may not achieve some old-growth attributes, such as large dead trees and large, well-decomposed woody debris, until 400 or more years following initiation. The two stands in this study with the longest period of development (at least 450 years) had balanced size and age structures and well-represented old-growth attributes such as large dead trees and large, well-decayed woody debris. Planted stands may achieve some ESSFwc3 old-growth features several decades sooner than natural stands, due to a shorter stand initiation period. The alternative silvicultural system that has been proposed for maintaining suitable mountain caribou habitat following harvesting in this area (group selection system with 240-year rotation) will likely result in stands with many old-growth features, including abundant arboreal lichens. Some features that may not be present in these stands include a uniform inverse-J age distribution, many large (>60 cm dbh) live and standing dead trees, and large-diameter, well-decayed woody debris. As old stands in the ESSFwc3 continue to age without outside disturbance, the spruce component of the stands will likely decline. Partial harvesting would help to maintain a significant component of spruce in these stands.
Download or read book Initial Partial Cutting in Old growth Spruce fir written by Robert R. Alexander and published by . This book was released on 1972 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ecology Silviculture and Management of the Engelmann Spruce subalpine Fir Type in the Central and Southern Rocky Mountains written by Robert R. Alexander and published by . This book was released on 1987 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Natural Regeneration in Intermountain Spruce fir Forests written by Carl E. Fiedler and published by . This book was released on 1985 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ten year Survival and Growth of Planted Conifers in a Group Selection Silvicultural System written by Teresa A. Newsome and published by . This book was released on 2017 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Understory Tree Release Following Harvest Cutting in Spruce fir Forests of the Intermountain West written by Ward W. McCaughey and published by . This book was released on 1982 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Management of Spruce fir in Even aged Stands in the Central Rocky Mountains written by Robert R. Alexander and published by . This book was released on 1980 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Long term Stand Dynamics in High elevation Engelmann Spruce subalpine Fir Forests written by M. J. Jull and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Long term Stand Dynamics in High elevation Engelmann Spruce subalpine Fir Forests written by Michael James Jull and published by . This book was released on 1990 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synopsis of Information on White Engelmann and Black Spruce Natural Regeneration in North America written by Everett B. Peterson and published by . This book was released on 1994 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt: Report providing a subjective assessment of the scope, applicability, and overall reliability of existing published references related to natural regeneration of white, Engelmann, and black spruce in North America and a synopsis of references on the subject. The references are listed alphabetically by author for each of 563 references, based on a dBASE IV database coded according to 105 keywords. The database allows the user to search geographically, by species of spruce, by forest section within Canada, or by any of the keywords listed. The emphasis is on white spruce in a boreal mixedwood setting but also includes information on natural regeneration of Engelmann spruce and upland black spruce, plus a limited amount of Norway spruce. Most of the references are from the 1990s.
Download or read book Factors Influencing the Density of Natural Regeneration in Uniform Shelterwoods Dominated by Douglas fir in the Sub boreal Spruce Zone written by Philip Joseph Burton and published by University of British Columbia Press. This book was released on 2000 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt: Three replicates of a uniform shelterwood trial were established in even-aged stands dominated by Douglas-fir in the SBSdw1 variant northeast of Williams Lake, B.C., with initial harvesting conducted in the summer of 1991. Treatments consisted of a two-stage shelterwood leaving 50% residual basal area (RBA) after the first entry and a three-stage shelterwood leaving 70% RBA, with overstory thinning achieved by hand-falling or by feller-buncher. Treatment units were 1.4 ha in area, with an uncut control (100% RBA) at each site. Seedfall was monitored using ten 0.37 m 2 seedfall traps in each treatment unit, inspected twice a year from 1992 through 1998. The abundance of different ground surface materials was surveyed in 1990, 1991, and 1993. Controlled germination experiments were conducted in 1994, 1995, and 1996. on four seedbed materials (forest floor, live moss, rotting wood, and mineral soil) across all RBA levels. Surveys of the density of natural regeneration were conducted in 1990, 1991, 1993, 1994, and 1996. ... Results to date suggest that a low residual basal area, combined with a high level of forest floor disturbance, is preferable for enhancing conifer regeneration. It is tentatively recommended that a preparatory cut is not necessary for naturally regenerating Douglas-fir under a shelterwood overstory in this zone, and that the seed cut should leave less than 50% residual basal area.
Download or read book Natural Regeneration of Engelmann Spruce After Clearcutting in the Central Rocky Mountains in Relation to Environmental Factors written by Robert R. Alexander and published by . This book was released on 1984 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Long term Stand Dynamics in High elevation Engelmann Spruce subalpine Fir Forests microform written by Michael James Jull and published by National Library of Canada = Bibliothèque nationale du Canada. This book was released on 1990 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Results of Regeneration Cutting in a Spruce subalpine Fir Stand written by Arthur Lawrence Roe and published by . This book was released on 1965 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Regeneration of Engelmann Spruce and Subalpine Fir in Southern British Columbia Following Clearcutting Project 3 61 written by and published by . This book was released on 1992 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt: This project involved the retrospective analysis of natural conifer regeneration in clearcut openings in the Engelmann Spruce-Subalpine Fir (ESSF) biogeoclimatic zone. Current stocking, ingress rate, and height growth of post-logging natural regeneration of Engelmann spruce and subalpine fir were studied. This memo summarizes the results of two years of data collection in the ESSF: 1988 in the Kamloops Forest Region and 1989 in the Nelson Forest Region.
